ELEKTROKEMISK ELEMENT MED FORMELDING OM AFSLUTNING AF LEVETID

摘要

A primary electrochemical element 1 is arranged to give a warning towards the end of the discharging of the element as an indication that the element is approaching the end of its life. The element comprises a tubular porous carbon cathode structure 6 arranged in a metal casing 4 for the element together with an anode structure 10 and an electrolytic solution 3. The anode structure 10 comprises a first and a second electrochemically active part, for example lithium and calcium with different oxidation potentials in the element which can be consumed by electrochemical reaction in the element during the discharging of this. The consumption of the active parts during discharging of the element results in there being established different operating voltages for the element which voltages can be distinguished from one another. The active parts are arranged in such a way in relation to each other that the active part with the highest oxidation potential (that is the lithium) is consumed before the second active part (that is the calcium). The change in the value of the operating voltage of the element during the successive consumption of the two active parts is detected to provide a warning indication as a sign that the element is approaching the end of its life.